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Hi there,
before you can download any code to your Nios you have to configure teh FPGA first. Use the Quartus programmer to download the .sof according to your NIOS first. After that you can download the NIOS code as often as you want, unless you do a power reset.
If you do have an EPCS or CFI Flash then you can download the .sof to it, after that you can directly start your NIOS programm.
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Thanks Dtelrest to answer me and tried to find a solution :) ^^,what you said I did it , and I don't found no problem with quartus , but the problem exists at Eclipse after making a new project and compiled an example (Hellow world ) it does not work but if I compile the example (Hellow word small) it works but I can't light the LEDs with (hellow world Small). :(
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